单项选择题

Living things are ______ cells, and cells do not grow to more than twice the size they were at first.

A．made from
B．made up of
C．made up from
D．made of
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单项选择题
______ your homework and make sure that you don't ______ any mistakes.
A．Do; do
B．Make; make
C．Make; do
D．Do; make
单项选择题
Because the company was doing more business, it was necessary to ______ the factory.
A．extend
B．increase
C．rise
D．lookers
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